Michael PhelpsDITCHING Hot GF toBro Out on Tropical Island

8/8/2012 2:15 PM PDT

Michael Phelps DITCHING GF Megan Rossee to Bro Out on Tropical Island

EXCLUSIVE

Michael Phelps told Bob Costas he wanted to travel the world after retiring from swimming ... and now TMZ has learned that Stop #1 is gonna be AWESOME ... a boys trip to one of the most expensive tropical islands in the world!!

Sources close to the couple tell TMZ, Phelps is planning to visit the Maldives with several close male friends in the near future -- a notoriously expensive island destination for the rich and famous ... so obviously, it's amazing.